My phone is a Motorola G13 with Android 13. My computer is a Thinkpad W541 with Debian 12. I'm trying to access Internet on the computer through the phone's 4G. I've tried to use the phone as a wifi hotspot, and I've tried to share the connection through USB. In both case, the computer connects to the local network correctly. The computer gets an IP address and a DNS server through DHCP. I can ping the DNS server from the computer. On the phone, I can access websites through the data. However, if I try to ping an external IP from the computer, I get a "network unreachable" error. Same with curl, same with any other protocol I could think of. Same after booting up the computer with a Ubuntu Live USB stick. Both through wifi and through USB tether. From all this, I'm inclined to think that there is some issue on the phone, that prevents the packets to be properly routed from the wifi/usb network, toward the 4g network. However, I have no idea how to actually find and fix the issue. I have already tried to change all the relevant settings I could find, and did a factory reset on the phone. None of that had any visible effect. I couldn't find any relevant help through googling either. Any suggestion would be appreciated. ---------- USB tether interface : curl --interface enx1e8d3a3d4e80 1.1.1.1 curl: (7) Failed to connect to 1.1.1.1 port 80 after 1 ms: Couldn't connect to server ethernet interface : curl --interface enp0s25 1.1.1.1 301 Moved Permanently

301 Moved Permanently

cloudflare ---------- EDIT : I've tried with a Windows 10 computer, and the network panel tells me "No Internet access : Your device is connected and can access other devices on your local network, but may not be able to reach the Internet." So the issue is definitely from the phone, not the Debian computer. ---------- EDIT : To answer comments : > Ping the gateway (your cell phone) : this works fine. > verify DNS resolution the dns answers, but the answer doesn't give an ip > Have you tried another tether method, like WiFi hotspot Exact same results as usb tether, as far as I can tell > another (friends) device with a similar plan/carrier I haven't any on hand, I'll try to see if I can find one.